Feeding device for grinding-mills.



A. W. STRAUB.

FEEDING DEVICE FOR GRINDING MILLS.

APPLICATION FILED DEC. 9, 1910.

Patented Sept. 24, 1912.

2 SHEETS-SHEET 1.

H 171:570036 WEE M,

gun W a-Magyar 1 A. W. STRAUB.

FEEDING DEVICE FOR GRINDING MILLS.

APPLICATION FILED DEC. 9, 1910.

2 SHEETS-11211! 2.

COLUMBIA PLANOGRAPN CO; WASHINGTON. D. c.

Patented Sept. 24, 1912.

AMBROSE W. STRAUB, 0F PHILADELPHIA, PENNSYLVANIA.

FEEDING DEVICE FOR GRINDING-MILLS.

Specification of Letters Patent.

Patented Sept. 24, 1912.

Application filed December 9, 1910. Serial No. 596,525.

To all whom it may concern:

Be it known that I, Aimnosn W. STRAUB, a citizen of the United States,residing in Philadelphia, Pennsylvania, have invented certainImprovements in Feeding Devices for Grinding-Mills, of which thefollowing is a specification.

One object of my invention is to provide a structure particularlyadapted for crushing or cutting and feeding such material as whole earsof corn with the husks to a pair of grinding disks or cutters; it beingespecially desired that the construction of parts shall be such as toprevent choking or clogging of the machine.

Another object of my invention is to provide a combined cutting andfeeding device for mill crushers which shall first cut or crush thematerial delivered by a hopper and shall thereafter force this materialbetween a pair of relatively movable grinding surfaces; the arrangementbeing such that one portion of said device shall hold or force a body ofmaterial toward the grinding disks until another portion thereof forcesa succeeding mass of material into said grinding members.

I also desire to provide a machine of the character described with novelmeans for preventing revolution of the material to be ground which shallinclude a section replaceable when worn.

These objects and other advantageous ends I secure as hereinafter setforth, reference being had to the accompanying drawings, in which rFigure 1, is a vertical section of a feed mill crusher showing myinvention as applied thereto; Figs. 2 and 3 are vertical sections on thelines aa and bb, Fig. 1; Fig. 4 is a plan of the machine shown, in Fig.1, the feeding cutter being removed; Fig. 5, is a perspective view ofthe cutting and feeding device invented by me; Fig. 6, is an endelevation of the device illustrated in Fig. 5; Fig. 7, is an enlargedfragmentary elevation of the active face of one of the grinding disks,and Fig. 8, is an enlarged vertical section of a portion of the diskshown in Fig.

In the above drawings, 1 represents portions of a supporting framestructure which, in addition to carrying bearings 2 and 3 for a shaft 4,supports a hopper 5 having a casing 6 for the reception of grindingdisks hereafter described in detail. The bottom of the hopper is made insubstantially semicylindrical form concentric with the shaft 4 and hasremovably mounted in it a feeding cutter or crusher 7 which is keyed orotherwise suitably fixed to the shaft 4. The interior surface of thehopper bottom has one or more slightly curved elongated teeth or ribsextending for the greater part of its length and adjacent the outletopening 10 of said hopper I provide in the bottom thereof a removableplate 6 having a number of independent teeth or ribs as shown. Thisplate is caused to conform to the generally curved interior surface ofthe hopper bottom in which it is set; being removably held in place byscrews or bolts.

The grinding casing 6 has an outlet 8 situated at any suitable point andis made in two separable parts having within it a plate 9 fixed t0 theshaft 4 and carrying a grinding disk 11 on its face adjacent the outlet10 of the hopper. A second grinding disk 12 is mounted parallel with andadjacent to the first disk 11. so as to co-act therewith, and forsupporting it I provide a tramming ring 12 carried by the tramming ringseat 12". This latter has trunnions 13 confined between the two parts ofsaid casing and also has two lugs 12 fitting recesses in the edge of thetramming ring so as to prevent revolution thereof. The central openingof the tramming ring seat is flanged and interiorly toothed, while theexterior surface of said flange is concaved to provide a rocking surfacefor the support of the tramming ring which has a convex surfaceco-acting with the rocking surface to permit automatic adjustment of thegrinding disk 12 under operating conditions.

The feeding cutter or crusher, although it may have more than twoblades, is preferably constructed as shown and consists of a cylindricalsleeve or body 14; on which are mounted two elongated and preferablyhelical, cutter or crusher blades 14* having a steep pitch and but arelatively slight inclination to the general line of the sleeve let. Thesurface of the advancing face of each of the blades is preferably madeas shown, with all. of its elements lying in a single plane so that itpresents a relatively extended plane surface at one end of the sleevel-ft and a relatively narrow, slightly overhung face at the other.Forming a continuation of this overhung end of each blade, immediatelyadjacent the outlet 10 of the hopper, is a relatively short and smallpitched blade section serving prin'larily as a conveyer element; itsfunction being to receive the material crushed and cut by the mainportion ll of the blade and forcibly deliver this through the outlet ofthe hopper into the space between the grinding disks 1.1 and 12. It willbe noted that with this construction the surface of the sleeve isbetween the two blades is altogether unobstructed and that the conveyingportion of each blade may be described formed by abruptly bending theend thereof adjacent the hopper outlet at an angle to the remaining mainportion so that it acts to force material out of the hopper. It will benoted further that while the outer edge of the main portion 14 of eachblade is relatively sharp, the similar part of the conveying section 15is wide and flat.

Under operating conditions the material to be ground, such as whole earsof corn including husks, etc., is delivered to the hopper, andrevolution of the shaft 4 by some suitable source of power, causes thecutting edge of the main portion l l of each blade to engage the variousportions of material, co-acting with the lower portion of one side andthe teeth or ribs in the bottom of the hopper to cut and crush thismaterial, which is gradually fed toward the outlet end of the hopperowing to the slight inclination of the said portions 1 1 of the blade.,lVhen it reaches the conveying section 15 of the feeding cutter, thislatter, after moving it in engagement with the toothed plate 6, so as tostill further outand crush it, forcibly as well as continuously deliversit through the toothed orifice of the tramming ring seat into the spacebetween the disks 1.1 and 12. Owing to the unimpeded passageway betweenthe blades on the sleeve 14;, the material is acted on without beingpermitted to choke or clog the machine, since any husks or shreds, beingheld from revolving by the ribs or teeth in the hopper, are sooner orlater cut by the portions 14 of the blades. Owing to the accumulation ofmaterial in the space between the grinding disks 11. and 12., suchmaterial is forced continuously out between them, during which processit is shredded and finally ground to an extent dependent upon theadjustment of the machine. From the peripheries of the grinding disksthe ground material then flows intothe main part of the casing G whenceit escapes through the opening 8 into a suitable container orreceptacle. Owing to the peculiar mounting of the tramming ring and thegrinding disk 12 carried thereby, these are at all times free toautomatically rock or swing to a limited extent upon the trannning ringseat so as to adjust said disk to properly cooperate with the disk 11 ingrinding the material operated on.

While I have described the hopper and flanged opening of the trammingring seat as provided with teeth, it will be noted that theseprojections may act as blades or abutments without departing from myinvention.

I claim 1. The combination of a hopper; a feeding cutter mountedtherein, said cutter having a body provided with an integral bladeformed with a cutting portion and a conveying portion continuoustherewith; and means for turning said feeding cutter, there being twoindependent series of teeth in the hopper placed to cooperaterespectively with said two portions of the cutter.

2. The combination of a hopper; a feeding cutter therein formed with abody portion; an integral blade having an elongated cutting portioninclined at a relatively slight angle to the line of the body, and arelatively short conveying portion extending abruptly from one end ofthe cutting portion; with means for turning the cutter.

3. The combination of a hopper; a feeding cutter therein formed with asubstantially cylindrical body having a plurality of integral blades,each of said blades having a relatively elongated sharp edged portionand a relatively short conveying portion extending at an abrupt angle tothe first portion; with means for turning said cutter.

at. The combination of a hopper; a feeding cutter rotatably mountedtherein formed with an elongated substantially cylindrical body havingan integral blade made in two helical portions; one of said portionshaving a relatively sharp cutting edge and a plane advancing face, andthe other portion extending at an abrupt angle to and forming acontinuation of one end of the cutting portion to constitute a conveyor;with means for turning said cutter.

5. A new article of manufacture; a feeding cutter consisting of asubstantially cylindrical body portion with an integral blade mountedthereon; said blade consisting of a relatively sharp edged cuttingportion extending at a relatively slight angle to the general line ofthe body and having a relatively short conveying portion extending at arelatively abruptangle to the cutting portion from one end thereof.

6. The combination of a hopper; a feeding cutter mounted therein, saidcutter hav- In testimony whereof, I have signed my mg a body providedwlth a blade formed name to this speclficatlon, 1n the presence with acutting and a conveylng portion; of tWo subscrlbing wltnesses.

means for turning said feeding cutter; and AMBROSE W. STRAUB. aremovable toothed plate in the hopper WVitnesses:

placed to cooperate With the conveying por- WVILLIAM E. BRADLEY,

tion of the cutter blade. WM. A. BARR.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

